from selenium import webdriver
from selenium.webdriver import ActionChains
from selenium.webdriver.common.by import By
import time

driver = webdriver.Chrome()
driver.get("http://www.itcast.cn")
driver.maximize_window()

element = driver.find_element(By.CLASS_NAME,'a_gd')
ActionChains(driver).move_to_element(element).perform()

time.sleep(50)
